IIS installation issue

Hi can you please help. I have installed SS on an IIS 7.5 server and the first screen i get after successfully installing is a broken home page see home.gif attached. Navigating to about us and contact us page shows the correct site. Then i try logging in to admin using /admin so it displays the login form which is good but after i hit submit button then it loads forever and later returns a message "CGI Timeout
The specified CGI application exceeded the allowed time for processing. check error.gif. I have tried index.php/admin check home.gif. I have run the site successfully on an Apache server and works fine. Now i don't know much about IIS with SS, i called my host provider to find out if mod_rewrite is enabled and they said it is enabled. Are there any changes i should do to the .htaccess or what? what am i missing? ohh just in case this would be helpful to help me "i am running SS v2.4.5"